CMAS CMAS Data Interpretation and Analysis 2 — Questions and Answers
Question 1: Which graph type is best for showing how a quantity changes over time?
- Pie chart
- Bar graph
- Line graph (Correct answer)
- Scatter plot
Correct answer: Line graph
Line graphs are specifically designed to show how a quantity changes continuously over a period of time.
Question 2: A double bar graph compares the reading scores of boys and girls across three grades. What is the main advantage of using a double bar graph for this comparison?
- It shows individual student scores
- It allows direct visual comparison of two groups side by side across multiple categories (Correct answer)
- It displays data as percentages of a whole
- It shows the relationship between two numerical variables
Correct answer: It allows direct visual comparison of two groups side by side across multiple categories
Double bar graphs place two bars side by side for each category, making it easy to visually compare two groups.
Question 3: A data set has values: 5, 7, 7, 9, 12. What is the mode?
- 7 (Correct answer)
- 8
- 9
- 12
Correct answer: 7
The mode is the value that appears most frequently; 7 appears twice while all other values appear once.
Question 4: On a coordinate grid, a point is located at (3, –2). In which quadrant is this point?
- Quadrant I
- Quadrant II
- Quadrant III
- Quadrant IV (Correct answer)
Correct answer: Quadrant IV
A point with a positive x-value and negative y-value is in Quadrant IV.
Question 5: A scatter plot shows points generally moving from the lower-left to the upper-right. What type of correlation does this show?
- Negative correlation
- No correlation
- Positive correlation (Correct answer)
- Inverse correlation
Correct answer: Positive correlation
When both variables increase together, the scatter plot trends upward from left to right, indicating a positive correlation.
Question 6: Which statistical question could be answered using data collected from a survey?
- What is the exact height of the Empire State Building?
- How many seconds are in an hour?
- How many hours per week do 5th graders in our school spend reading? (Correct answer)
- What is the boiling point of water?
Correct answer: How many hours per week do 5th graders in our school spend reading?
A statistical question anticipates variability in answers; asking about reading hours across many students requires data collection and analysis.
CMAS CMAS Data Interpretation and Analysis 2
Which graph type is best for showing how a quantity changes over time?